Indeed, but I don't want to set Never on anything at the Registered user level 'cause that's just nonsense. So if I unset View, there's no specific Allow setting for Account Upgrades, whereas there are Allow settings for almost everything else.
Doesn't allowing view, but having everything else set to Not Set do what you want? Admittedly you can access more than just the user upgrades page, but you can't really do very much else here. A few template edits may hide the rest of the things you don't want.
In another thread I pointed out to you a couple of paid membership systems (which I think is what you're aiming for) were these no good?